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Old November 19th, 2012, 11:01 PM   #1 (permalink)
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Buzz in f/x loop

What could it be?

Tried all individual pedals and none make it better or worse.

Changed cables and still there.

Unplug the loop and it goes away...

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Old November 19th, 2012, 11:23 PM   #2 (permalink)
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If it is tube driven reverb, it could be a tube.... or maybe try cleaning the loop jacks with some contact cleaner and work a plug in and out
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Old November 20th, 2012, 07:06 PM   #3 (permalink)
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The f/x loop is tube driven... literally peaceful without the loop engaged... time to go shopping...
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Old November 21st, 2012, 07:30 PM   #4 (permalink)
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new 12At7, same old hum... possibly slightly better.

I'll get some contact cleaner as suggested before I go ape**** about this

Would any other tube be even quieter, like an ECC82 maybe?
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Old November 21st, 2012, 10:22 PM   #5 (permalink)
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ECC 82 (12au7) is a lower gain than a 12at7 so it would be less noisy to some extent in most circumstances. The transconductance is lower than 12at7, but it's designed as a "driver" tube like a 12at7 is as far as function.
You didn't mention what amp this is in so if it's just an effects loop I'd still give it some contact cleaner and run a cable thru the jacks a few times just to clean any oxidation that might be there.
Also, check the recovery tube and make sure it's seated firmly.
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